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1916. The last of the RBVZ's First World War fighters, the S-20, embodied lessons learned from licence manufacture of the French Nieuport 17. The production version, with a 120hp Le Rhone engine, was said by its pilots to be faster than the Nieuport, with a top speed of 190km/h; but only five were ordered, leaving the RBVZ free to concentrate on production of its Ilya Mourometz bombers.